"The fact that a bit of software is installed on my computer is not proof that I installed it. My next door neighbour could have come in and clicked the button." That sounds like a dodgy premise to me, Phantast. If your neighbor planted child-porn on your computer, or explosives in your basement and they caught you, do you think they'd believe you? Generally, a person is held to be responsible for the contents of his own personal property. "it's up to someone else to prove that I clicked it" And THAT statement is even dodgier! mac